A four pole alternator is used to supply a factory at 50Hz. Determine the speed at which the alternator must be driven.
To determine the speed at which the alternator must be driven, we can use the formula:
Speed (in RPM) = 120 * Frequency (in Hz) / Number of Poles
In this case, the frequency is given as 50Hz and the number of poles is given as four. Plugging these values into the formula, we get:
Speed (in RPM) = 120 * 50 / 4 = 1500 RPM
Therefore, the alternator must be driven at a speed of 1500 RPM.